The energy of a flying plane can be split into kinetic and potential energy.The total energy can be transformed from one form to another. If the plane does so, it travels along a socalled Constant Energy Height. (As long as no energy is lost, so only theoretical!)

Fenster schliessen

How can an airplane change its energy height?

By applying excess power.

The time rate of change of Energy Height is equal to the Specific Excess Power (SEP)

Fenster schliessen

How do the speeds for best (maximum) ROC and minimum power in level flight compare?

(based on the assumption that propeller efficiency and available power are both independent of speed)